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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) | 12 Months Ended | 36 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Jan. 01, 2019 | Dec. 31, 2015
Cash and Cash Equivalents, at Carrying Value, Ending Balance | $ 7,600,000 | $ 14,612,000 | $ 6,377,000 | $ 7,600,000 |  | $ 5,566,000
Equity Securities, FV-NI | $ 0 | 0 |  | 0 |  |
Number of Operating Segments | 4 |  |  |  |  |
Self Insurance, Per Claim Amount, Personal Injury and Property Damage Claims |  |  |  | 500,000 |  |
Self Insurance, Per Claim Deductible, Workers' Compensation Claims |  |  |  | 100,000 |  |
Self Insurance Reserve | $ 260,000,000 | 238,000,000 |  | 260,000,000 |  |
Prepaid Insurance, Current and Noncurrent | 261,000,000 | 256,000,000 |  | 261,000,000 |  |
Assets, Current, Total | 1,502,981,000 | 1,338,728,000 |  | 1,502,981,000 |  |
Subsequent Event [Member] |  |  |  |  |  |
Operating Lease, Right-of-Use Asset |  |  |  |  | $ 102,400,000 |
Operating Lease, Liability, Total |  |  |  |  | $ 102,400,000 |
Accounts and Other Receivables, Net, Current [Member] |  |  |  |  |  |
Assets, Current, Total | $ 158,000,000 | $ 193,000,000 |  | $ 158,000,000 |  |
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Top 10 Customers [Member] |  |  |  |  |  |
Concentration Risk, Percentage | 30.00% | 29.00% | 29.00% |  |  |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Top 10 Customers [Member] |  |  |  |  |  |
Concentration Risk, Percentage | 32.00% | 31.00% |  |  |  |
Minimum [Member] |  |  |  |  |  |
Property, Plant and Equipment, Salvage Value, Percentage | 10.00% |  |  | 10.00% |  |
Finite-Lived Intangible Asset, Useful Life | 5 years |  |  |  |  |
Maximum [Member] |  |  |  |  |  |
Property, Plant and Equipment, Salvage Value, Percentage | 30.00% |  |  | 30.00% |  |
Finite-Lived Intangible Asset, Useful Life | 10 years |  |  |  |  |
Tractors [Member] | Minimum [Member] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life | 4 years |  |  |  |  |
Tractors [Member] | Maximum [Member] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life | 10 years |  |  |  |  |
Trailing Equipment [Member] | Minimum [Member] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life | 7 years |  |  |  |  |
Trailing Equipment [Member] | Maximum [Member] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life | 20 years |  |  |  |  |
Land, Buildings and Improvements [Member] | Minimum [Member] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life | 10 years |  |  |  |  |
Land, Buildings and Improvements [Member] | Maximum [Member] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life | 40 years |  |  |  |  |
Furniture and Fixtures [Member] | Minimum [Member] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |  |  |  |
Furniture and Fixtures [Member] | Maximum [Member] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life | 10 years |  |  |  |  |
Trade Accounts Receivable [Member] |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable, Ending Balance | $ 23,600,000 | $ 15,400,000 |  | $ 23,600,000 |  |
Other Receivables [Member] |  |  |  |  |  |
Cash and Cash Equivalents, at Carrying Value, Ending Balance | $ 12,200,000 | $ 8,600,000 |  | $ 12,200,000 |  |

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